Add support for Pull Queues to prod implementation.

filter/count/tq.go

 // Copyright 2015 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 package count
 
 import (
+        "time"
+
         "golang.org/x/net/context"
 
         tq "github.com/luci/gae/service/taskqueue"
 )
 
 // TQCounter is the counter object for the TaskQueue service.
 type TQCounter struct {
         AddMulti    Entry
         DeleteMulti Entry
+        Lease       Entry
+        LeaseByTag  Entry
+        ModifyLease Entry
         Purge       Entry
         Stats       Entry
 }
 
 type tqCounter struct {
         c *TQCounter
 
         tq tq.RawInterface
 }
 
 var _ tq.RawInterface = (*tqCounter)(nil)
 
 func (t *tqCounter) AddMulti(tasks []*tq.Task, queueName string, cb tq.RawTaskCB) error {
         return t.c.AddMulti.up(t.tq.AddMulti(tasks, queueName, cb))
 }
 
 func (t *tqCounter) DeleteMulti(tasks []*tq.Task, queueName string, cb tq.RawCB) error {
         return t.c.DeleteMulti.up(t.tq.DeleteMulti(tasks, queueName, cb))
 }
 
+func (t *tqCounter) Lease(maxTasks int, queueName string, leaseTime time.Duration) ([]*tq.Task, error) {
+        tasks, err := t.tq.Lease(maxTasks, queueName, leaseTime)
+        t.c.Lease.up(err)
+        return tasks, err
+}
+
+func (t *tqCounter) LeaseByTag(maxTasks int, queueName string, leaseTime time.Duration, tag string) ([]*tq.Task, error) {
+        tasks, err := t.tq.LeaseByTag(maxTasks, queueName, leaseTime, tag)
+        t.c.LeaseByTag.up(err)
+        return tasks, err
+}
+
+func (t *tqCounter) ModifyLease(task *tq.Task, queueName string, leaseTime time.Duration) error {
+        return t.c.ModifyLease.up(t.tq.ModifyLease(task, queueName, leaseTime))
+}
+
 func (t *tqCounter) Purge(queueName string) error {
         return t.c.Purge.up(t.tq.Purge(queueName))
 }
 
 func (t *tqCounter) Stats(queueNames []string, cb tq.RawStatsCB) error {
         return t.c.Stats.up(t.tq.Stats(queueNames, cb))
 }
 
 func (t *tqCounter) GetTestable() tq.Testable {
         return t.tq.GetTestable()
 }
 
 // FilterTQ installs a counter TaskQueue filter in the context.
 func FilterTQ(c context.Context) (context.Context, *TQCounter) {
         state := &TQCounter{}
         return tq.AddRawFilters(c, func(ic context.Context, tq tq.RawInterface) tq.RawInterface {
                 return &tqCounter{state, tq}
         }), state
 }